Messages in this thread | | | Date | Wed, 16 Feb 2011 11:09:57 +0100 | From | Ingo Molnar <> | Subject | Re: 2.6.38-rc2: Uhhuh. NMI received for unknown reason 2d on CPU 0. |
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* Cyrill Gorcunov <gorcunov@gmail.com> wrote:
> On 2/16/11, Ingo Molnar <mingo@elte.hu> wrote: > > > > * Cyrill Gorcunov <gorcunov@gmail.com> wrote: > > > >> On Wed, Feb 16, 2011 at 11:37 AM, Ingo Molnar <mingo@elte.hu> wrote: > >> ... > >> >> >> > >> >> > > >> >> > Ping on this problem, still seeing > >> >> > > >> >> > Uhhuh. NMI received for unknown reason 3c on CPU 0. > >> >> > Do you have a strange power saving mode enabled? > >> >> > Dazed and confused, but trying to continue > >> >> > > >> >> > on my Pentium-D system here with latest Linus head. > >> >> > > >> >> > its sometimes 3c, sometimes 3d, I'm going to bisect and push for > >> >> > reverts if nobody still has any clue about how to fix this. > >> >> > > >> >> > Dave. > >> >> > > >> >> > >> >> We still trying to resolve it but without success yet. There is no > >> >> easy way to revert it. One of the option might be to disable perf on > >> >> p4 for a while. If this is acceptable -- i'll cook such patch and send > >> >> it to Ingo. Hm? > >> > > >> > That's not really acceptable - need to fix it or revert it to the last > >> > working > >> > state. Which commit broke it? > >> > > >> > Thanks, > >> > > >> > Ingo > >> > > >> > >> I can't say you the commit id after which unknown-nmi start happening > >> (i'm out of git tree > >> at moment) but even then this commit should not be reverted since the > >> problem is in > >> p4 code not in the rest of perf system. > >> > >> I have two patches here (attached) and would really appreciate of > >> their testing on HT machine > >> together with kgdb bootup tests enabled. Dave could you please? > > > > Could these patches fix Dave's non-kgdb problem? Dave isnt using kgdb but is > > probably using perf which triggers NMIs? Dave, can you confirm that? > > > > And it's a spurious NMI message, not actual lockup or other misbehavior, > > right? > > > > Thanks, > > > > Ingo > > > > For nonkgdb case 'unflagged nmi fix' patch should be enough. i've > tested it on non-ht machine by self. without it there is no lockup > but only a message about unknown nmi.
Ok, please submit it ASAP then - that ought to address the regression. Please Cc: Dave to the patch.
Thanks,
Ingo
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